Congress needs to pass some laws to better police government officials, leaking, lying, plotting etc. Using government resources for political purposes should be a felony and a low bar to prove.
Congress? It doesn't matter what Congress passes, it has to be signed by the President, then enforced by the President's Department of Justice.
When a Democrat FIB goes after a Republican, and the DOJ and Presidency are both Democrats, no law in the world will change what (won't) happen.